Miner&#39;s electric safety-lamp



J. JONES. MINERS ELECTRIC SA'FETY LAMP.

APPUICATION FILED MAY l0, 1920.

Patented Apr, 5, 1921,i

un g .wie F JOHN WILLIAM JONES, OF

MINERS ELECTRIC SAFETY-LAMP.

Specilication of Letters Patent.

' Patented Aprr, 1921.

Application filed May 10, 1920.V Serial No. 380,328.

`T 0 all whom it may conccm:

Be it known that I, JOHN WILLIAM JONES, a subject of the King of GreatBritain and Ireland, residing at Vave Crest, Blackfords,

lannoclr, Stalfordshire, England, have invented certain new and usefulImprovements Relating to Miners ElectricSafety-Lamps, of which thefollowing is a specification,

This inventionlrelates to miners electric safety lamps and has for itsspecial object to provide a flash lamp .of a simple and light formsuitable forthe use of colliery officials, the lamp being provided ofsuch a form that it can-be carried in the pocket or be attached to abelt by means ofa' hook, or be carried n any other suitable way.

The invention comprises "the construction which is hereinafterdescribed. The invention is illustrated by way of example in theaccompanying drawings inv which Figure 1 is a vertical section ofa lampconstructed according to the invention.

Fig. 1a is a detail cross section in a plane transverse to the plane ofthe section Fig. 1`. Fig. 2 is an under plan of the top part of thelamp, and

Fig. 3 is a plan view of the bottom part or casing carrying the cell.

As illustrated in the accompanying drawings the top part of the lamp isprovided as a cylindrical casing `a at the top of which`-y there ismounted a bulls eye lens Z7. An annular groove b1 is provided for thereception of a jointing ring of rubber or other suitable material b2which is mounted within the annular groove b1 so as to protrude slightlyand thus to make a tight joint with the cylindrical casing a. v

The cylindrical casing is at its upper edge inwardly diverted at a1 forthe retention of the lens b in position and means are provided such asthe formation of an inwardly protruding ridge at a? on the cylindricalcasing a by means of which the lensb may be supported. v

Beneath the lens b the lamp bulb c is mounted. This is carried within asocket 01 carried by anV armor fitting'c2 secured to the contact plateal. The plug ci* of the lamp bulb is screw threaded for insertion withinthe screw threaded b'ore of the socket o1 and the lower end of the plugc4 engages the contact e which is supported upon a spiral spring f, thelower end of which is secured by which the to the central contact gmounted beneath the Contact plate d, the spring f being advantageouslysecured in position by a screw It contact is thus also held in itsposition within a recess of corresponding, form on the under side of thecontact plate d. The second contact z' is formed as a bushing and isfitted in a recess of correspending form in the contact plate d and ascrew 1 serves to secure an upstanding contact plate j to the contact i.

The contact plate d is carried within a cylindrical fitting lc mountedwithin and secured at the lower end of the cylindrical casing a. Thiscylindrical litting c has -at its upper end an inwardly extending flange.701 for the retention of the contact plate d and the lower partof theinner face ofthis fitting is screw threaded for the reception of aretaining ring Z by which the contact plate d may be held withinthecylindrical tf per end of the casing or container o of the Y cell pso that thus a lead rivet g may be in'- y troduced through the alinedholes m1 n1 for locking the casing or `container 0 to the top 0f thelamp. A switch 1' may be provided on the casing aand operable by a pinor plug r1 upon the outwardly protruding end of which a button r2 ismounted so thaty thus contact may be made with the upstanding contact orplate j by causing the pin or plug r1 to move inwardly. The constructionof the cell p and the casing or container o may be similar to thatdescribed in the specification filed pursuant to theco-pendingapplication No. 316,792, dated 11th August, 1919, which -hasmaturedl into Patent-1,352,636, dated Sept. 14, 1920. V

It will be understood that current may pass from the cell through thecontact g, the spiral spring f and the plug ofthe lamp bulb, thencethrough the lilament of the lamp through the socket c1 and the tting c?,

the lamp top, a lens surm'ounting and car- Y red by thel'saidcylindrical casing, a contact plate Within the said'cylindrical casing,

said contact plate carrying a centrally disposed contact and a laterallydisposed concarried. centrally vin the Vsaid transversely disposedfitting, and a switch on the said cylindrical casing operablefromoutside and adapted to complete the circuit by contact with theupstanding contact plate aforesaid, substantially as described.

2. Anelectric 'safety flash lamp, consisting in combination of thecylindrical casing ,0f the lamp top, a lens surmounting and carriedbythe said cylindrical casing, a contact plate Within the saidcylindrical casing, said ,contactplate carrying a centrally disposedContact and. a laterally disposed contact plate, a transversely disposedfitting Within the said cylindrical casing, said fitting being supportedat its respective ends upon the said contactplate, lamp bulb carriedcentrally inthe said transversely disposed fitting, a switch on the saidcylindrical casing'andpornprising a sliding member operable `fromoutside, said switch being adapted to complete the circuit by contactwith the upstanding contact stantially as described. y

f JOHN WILLIAM JONES.

plate aforesaid, sub- 30

